Year	per person
1800	1.701
1820	1.701
1950	2.896
1970	4.561
1971	4.893
1972	5.273
1973	5.752
1974	6.152
1975	6.385
1976	7.038
1977	7.543
1978	8.259
1979	8.504
1980	8.478
1981	8.469
1982	8.492
1983	8.369
1984	8.592
1985	8.99
1986	9.851
1987	10.85
1988	11.26
1989	12.07
1990	12.81
1991	13.28
1992	13.37
1993	13.11
1994	13.45
1995	13.77
1996	14.1
1997	14.67
1998	16.59
1999	17.85
2000	18.98
2001	18.25
2002	18.35
2003	19.43
2004	18.15
2005	20.02
2006	19.55
2007	20.51
2008	20.96
2009	19.36